Description
10"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 11.75"w x 19.75"h] Grille our Butterfly Damper simplifies the Condensate Pump MFACRA88W1 Product Details Size 20 our Butterfly Damper simplifies the process of managing airflow + Product Details Size – 18"w X 26"h is the size for the duct opening measurement only